Method of high-viscosity oil deposits development with possibility of periodic formation heating

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the petroleum industry. Method of high-viscosity oil deposits development with possibility of periodic formation heating is characterized by that well is made with dual system of vertical and lateral shafts, wherein both shafts are connected with the same productive formation, lateral shaft face is arranged in 20–25 m from vertical shaft face. Before operation start small-size pump equipment is lowered into well, and parallel tubing string with packer is lowered to vertical shaft face, after that formation warm-up process is initiated via thermal gas-chemical effect, thermo baro chemical processing in mode of gas-liquid fracturing of formation using high-temperature solid-fuel sources or hydro-oxidizing or fuel-oxidizing compositions with heating of near-face area of vertical shaft to depth sufficient for heat effect coverage of near-face section of lateral shaft. Then heating is stopped and product extraction from lateral shaft is started varying duration of cycle depending on rate of reduction of flow. Then product extraction is stopped and formation heating cycle is repeated without lifting of pumping equipment from well, then lateral shaft is put to operation again in product extraction mode.

EFFECT: intensification of oil production and high degree of reserves development with simultaneous reduction of costs and minimizing power consumption for heating of formation, creation of conditions for periodic temperature increase up to 800–1,200 °C and more with thermal front spreading at given depth from source, preservation during heating of filtration-capacitance properties of near-face area of shaft, operated in mode of product extraction, reduced number of tripping operations, high safety of work on wells.

1 cl, 1 tbl, 2 dwg

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: system comprises several data acquisition units (one unit per a well subject to risk of boreholes contact) consisting of vibration sensor, amplifier-converter, wireless network and antenna module and personal computer connected to wireless network and having software that includes data receipt unit, multichannel unit for cepstrum calculation, multichannel unit for cepstrum samples storage, multichannel unit for calculating cepstrum correlation, multichannel unit for comparing correlation factors with warning threshold and unit coding data to format of the geological and engineering survey station.

EFFECT: early detection of hazardous contact of a drilled well with existing well and potential change of the drilling path in order to prevent contact of boreholes.

1 dwg

FIELD: mining.

SUBSTANCE: in the process of construction of horizontal well, the deviated hole is drilled through the rocks, descending of the upper casing pipe, cementing the borehole annulus behind the upper casing pipe, drilling the horizontal shaft from the upper casing pipe to the lower oil reservoir, descending of the lower casing pipe with a partial placement of the latter in the lower part of the upper casing pipe, cementing the borehole annulus behind the lower casing pipe, perforation of the horizontal shaft, descending to the upper casing pipe of flow string with a packer with mounting of the packer and the shoe of the flow string in the upper casing pipe over the lower casing pipe, and performing the hydraulic fracturing in the horizontal shaft. As a part of the upper casing pipe in the interval of the upper producing layer the well casing of increased thickness are used, where the packer is placed. During the hydraulic fracturing of the lower oil reservoir the pressure is created over the packer, which is allowed on the upper casing pipe. Then the simultaneous release of pressure above and below the packer is carried out, perforating of the upper casing pipe is carried out in the interval of the upper oil reservoir, and development of the well. The height of the cement sheath between the packer top and the lower oil reservoir is determined from the ratio: LPHFLPOP2, where PHFL is pressure of hydraulic fracturing of the layer, MPa; POP is pressure in the over-packer space in the process of hydraulic fracturing of the layer, MPa; L is the height of the cement sheath between the packer top and the lower oil reservoir, m; 2 is the reliability coefficient of the cement sheath, MPa/m.

EFFECT: elimination of flows in the hydraulic fracturing crack, crushing the production casing above the place of the packer mounting, and reduction of water cut of the excavated product.

1 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: invention is related to alignment devices, in particular, to devices to be used for alignment of drilling rigs to ensure correct direction of drilling. The laser alignment device intended for use with a drilling rig has an extended drilling rod and a drill head unit comprising at least a pair of laser radiating devices mounted independently at the head unit, at that each laser device can be moved only in one plane and is oriented in essence in opposite directions in regard to each other to set the alignment plane, fasteners to fix the drill head unit to the drill rig and a unit with adjustable length to adjust distance between the head unit and drilling rod.

EFFECT: laser adjustment device is made for alignment of the drilling rod direction in regard to survey marks using the scan plane.

25 cl, 21 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and may be used in construction of horizontal wells. The concept of the invention is as follows: horizontal well construction method includes drilling of a vertical section, a curved section and horizontal section, running of the casing pipe to the well and cementing. According to the invention drilling of a horizontal section is made with input to the productive stratum. Production string is run in with filtering lower part having length not less than the depth of input to the productive stratum. The packer is set above the filtering part of the string. A circulation valve is set above the packer and tubular annulus is cemented through the circulation valve. Upon cementing the packer is drilled out and drilling is continued with entry to the below stratum, rising to the productive stratum and drilling in the productive stratum.

EFFECT: improving increase of the production part of the well, area of its supply and increase of the well flow rate.

1 ex, 1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling of heat-injection wells, injection of heat carrier into bed, drilling of vertical drain-extract well at the deposit center, dewatering and drying of bed and product extraction therefrom. Note here that heat-injection two-mouth wells are drilled of horizontal-circular profile in radius equal to that of isometric deposit. Drilling is performed by coiled-tubing process (flexible tube) with using of flexible tube as well casing. Said flexible tube is not cemented. Flexible tube is perforated toward deposit center and to vertical drain-extract well.

EFFECT: efficient extraction of bitumen and increased yield.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of ultraviscous oil deposit includes construction of double-mouth upper injector and lower producer with horizontal sections, which are equipped with strainers having stacked openings. The strainer of the injector horizontal section is divided into two heating areas. Inside the strainer, opposite each heating area, liners with holes are installed, which are run in at ends of pipe strings from mouths of the injector. The liners are fixed rigidly to the respective pipe strings with possibility of hermetic closing or opening of the openings in the injector horizontal section. At the surface inner space of the pipe strings inside the injector are bundled by a pipeline with valves, while tubing-casing annulus of the injector is bundled by suction and discharges pipelines equipped with valves and a steam-generating plant. The pumping unit is bundled by hydraulic lines to tubing-casing annulus of the injector. At closed openings of the strainer at the injector horizontal unit heating of the cross-borehole stratum area is made, viscosity of ultraviscous oil is reduced in the stratum by closed circulation of heat carrier through tubing-casing annulus and inner space of the upper and lower double-mouth wells by the steam-generating plant without injection of the heat carrier to the stratum and heated ultraviscous oil is extracted from the producer. In process of closed circulation of the heat carrier through the injector, when temperature in the extraction area of the producer rises up to the value corresponding to viscosity of ultraviscous oil in the stratum sufficient for its solving by a hydrocarbon solvent the steam-generating plant is switched off and circulation of the heat carrier is stopped. Openings in the strainer of the injector horizontal section are opened by means of their matching to the holes in the liners. Hydrocarbon solvent is pumped by the pumping unit through tubing-casing annulus and strainer to the stratum thus forming a chamber with the solvent in the stratum where heated ultraviscous oil is liquefied. At that heated and liquefied ultraviscous oil is being extracted from the producer. As heated and liquefied ultraviscous oil is extracted, in result of stoppage of steam circulation temperature decreases and viscosity of oil increases in the extraction area up to the value corresponding to viscosity of ultraviscous oil in the stratum insufficient for its solving by hydrocarbon solvent. Thereafter the pumping unit is switched off and openings are closed in the upper double-mount injector by means of their disconnection with liners holes. The steam-generating plant is switched on and circulation of the heat carrier is resumed in the upper double-mouth injector. Further the process is repeated.

EFFECT: excluding water flooding of the stratum and water cut of the extracted oil, potential use of the method at bitumen deposits with thickness of layers up to 5-7 m, even development of the deposit, increasing oil recovery factor.

5 dwg

FIELD: mining.

SUBSTANCE: method comprises determining the direction of carrying out counter-heading drivage using instrumental method, drilling counter-heading drivage, charging and blasting the holes, airing the bottomhole and removal of the exploded rock mass. In one of the counter-heading drivage the hole is drilled in the center of the bottomhole. Before drilling in the counter-heading drivage opposite to it the direction of counter-heading drivage is additionally determined on the greatest degree of exposure of vibration of the surface of the rock mass by the palm of the hand by applying the palm of the hand to the surface of the rock mass in the center and in other parts of the bottomhole.

EFFECT: reduction of costs for counter-heading drivage at their breakthrough by reducing the amount of deviation from the predetermined direction at their breakthrough.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling with the boundaries of one formation of parallel horizontal or inclined horizontal injection wells and production well, injection of heat carrier in injection wells and oil withdrawal from production well. Production well is located at equal distance from injection well bottoms which rules out heat carrier outburst bur allows hydrodynamic communication with injection wells. Injection wells are provided with two parallel channels with filters alternating over production reservoir length. Channels are used for injection of heat carrier while, after reservoir heating, one of said reservoirs is used for in-well product flow towards production well.

EFFECT: higher efficiency.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling of heat injection wells, injection of heat carrier into bed, drilling of drain holes, well dewatering and product sampling. Note here that drilled heat injection wells feature circular shape. Note also that heat-and-mass transfer occurs via forced convection from heat-injection well. Bed product is extracted via vertical drain-production wells by piston displacement of bitumen and thick oil by superheated high-pressure steam from deposit periphery to vertical drain-production well. Flow density is defined by the formula: P=h(Tf-Ts), where P is heat flow through area unit or interface volume; h is heat emission factor; Tf is fluid flow temperature; Ts is solid phase temperature. Note that heating radius is defined by the formula: r=QsCvτπhi, where Qs is volume flow of steam injected in the well, m3/h; Cv is latent specific heat of vaporisation at injection pressure, kJ/kg; τ is time, h; h is productive bed depth, m; i is specific heat content in steam zone at design pressure, kJ/kg.

EFFECT: higher yield, control over heat carrier distribution.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: at construction of a horizontal oil well construction drilling of a vertical wellbore is done through rocks, including unstable clay rocks with entry to a productive formation, running-in of the production casing up to the productive formation, cementing of a borehole annulus and drilling of a horizontal offshoot from the production string. Running-in of a shank with length from the bottomhole up to the depth of unstable clay rocks not less than 50 m, cementing space behind the shank, perforation of the horizontal borehole and hydraulic fracturing in the horizontal borehole with placement of a hydraulic fracturing arrangement in the production string and setting of the packer for hydraulic fracturing and tubing string shoe in the production string over the shank is carried out.

EFFECT: increase of well productivity.

1 ex

The invention relates to the oil industry and can find application in the development of oil deposits with low-permeability reservoir

FIELD: oil and gas industry.

SUBSTANCE: method relates to oil and gas industry, namely to improvement methods of well oil and gas recovery. A formation method of a fractured reservoir by pressure of gaseous products involves arrangement in the perforation area of wells of an oxidising compound and fuel, initiation of its firing and fixation of the fracture against closure; in order to increase permeability of the formation and the bottom-hole zone containing alkali and alkaline-earth rocks, they are neutralised by nitric acid till salts of nitrates are formed with exposure during several hours for the acid to react with the rock; combustible components of the rock or the fuel additionally supplied to the well is used as the fuel, and decomposition of salts of nitrates and the fuel till gaseous state is performed by a thermal source supplied to the well: by a powder pressure generator or an iron-aluminium mixture (thermite), or by a combustible and oxidising compound.

EFFECT: increasing the zone of the fractured reservoir and its permeability.

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to extraction of light oil and/or fuel out of natural bitumen from oil shale and/or oil-berating sand. According to the method natural bitumen is extracted by water separation from oil shale and/or oil-berating sand with formation of solid residue, volatile hydrocarbons are distilled from natural bitumen, at that insoluble oil coke remains with inclusion of up to 10% of sulphur, gaseous hydrocarbons upon distillation are divided by fractional condensation into light oil, raw oil and different fuels. The method is featured by the fact that solid residue of water separation and/or oil coke are used thermally, at that they are converted by substochiometric oxidation by oxygen-containing gas (26) in counteflow gasifier (19) interacting with movable layer of loose material (21), at addition of alkali substances at temperature <1800°C to gaseous split products with low sulphur content these split products are further converted by substochiometric oxidation to sensible heat, which is used for generation of heated water medium for physical grinding of oil-bearing sand and/or oil shale (A) and/or for separating natural bitumen from rock mass and/or as process heat for thermal breaking of natural bitumen, and by adding alkali substances at reductive conditions gaseous sulphur-containing products produced in counterflow gasifer (19) are converted at temperature of more than 400°C from ingredients of carbon- and sulphur-containing residues by chemical reaction with alkali substances to solid sulphur-containing compounds, and these solid sulphur-containing compounds are treated at least partially by gaseous products of the reaction and removed from gaseous phase by separating fine-grain materials at temperature higher than 300°C.

EFFECT: improved energy balance, prevented threat to environment.

13 cl, 2 dwg

FIELD: oil industry.

SUBSTANCE: invention relates to oil and gas industry and is intended for development of high-viscosity oil and bitumen deposits by heating. Technical result is increase of efficiency of deposit heating, increased coverage of deposit heating, higher volumes of extraction of oil and bitumen, reliability of the method. Method of high-viscosity oil and bitumen deposit development includes drilling of two process wells and one production well with horizontal shafts, installation of electrodes in horizontal shafts of process wells, connection of electrodes to electric substation at wellhead, placing of electric centrifugal pump in the horizontal shaft of production well, heating of the deposit with electric current with the help of electrodes installed in horizontal shafts of process wells, extraction of heated oil and bitumen from deposit by electric centrifugal pump from horizontal shaft of production well. Initially at least one production well and one heating well with horizontal shafts are drilled arranged in parallel to each other at distance of 15 m. Then in the upper horizontal shaft of the heating well hydraulic fracturing is performed with formation of longitudinal cracks and attachment of current-conducting material. Then, perpendicular to the initial section of horizontal shaft of heating well first process well with horizontal shaft is drilled, and perpendicular to the end section of horizontal shaft of the heating well second process well with horizontal shaft is drilled, wherein, horizontal shafts of process wells are placed within the limits of cracks of hydraulic fracturing of formation. Then between process wells parallel to their vertical shafts and perpendicular to their horizontal shafts of heating and production wells two additional production wells are drilled. Horizontal shafts of additional production wells are arranged in parallel and between the upper and lower horizontal shafts of heating and production wells. Pump string rods are used as electrodes. Lower horizontal shaft of production well and horizontal shafts of the additional production wells are equiped with electric-centrifugal pumps. Deposit is heated by means of upper horizontal shaft of heating well, and heated oil and bitumen are extracted by electric centrifugal pumps through the lower horizontal shaft of production well and horizontal shafts of additional production wells.

EFFECT: proposed method of development increases efficiency of heating of high-viscosity oil and bitumen, simplifies technological process of method implementation, increases coverage of deposit heating, increases volume of heated oil and bitumen extraction, reliability of method implementation.

1 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the petroleum industry. Method of high-viscosity oil deposits development with possibility of periodic formation heating is characterized by that well is made with dual system of vertical and lateral shafts, wherein both shafts are connected with the same productive formation, lateral shaft face is arranged in 20–25 m from vertical shaft face. Before operation start small-size pump equipment is lowered into well, and parallel tubing string with packer is lowered to vertical shaft face, after that formation warm-up process is initiated via thermal gas-chemical effect, thermo baro chemical processing in mode of gas-liquid fracturing of formation using high-temperature solid-fuel sources or hydro-oxidizing or fuel-oxidizing compositions with heating of near-face area of vertical shaft to depth sufficient for heat effect coverage of near-face section of lateral shaft. Then heating is stopped and product extraction from lateral shaft is started varying duration of cycle depending on rate of reduction of flow. Then product extraction is stopped and formation heating cycle is repeated without lifting of pumping equipment from well, then lateral shaft is put to operation again in product extraction mode.

EFFECT: intensification of oil production and high degree of reserves development with simultaneous reduction of costs and minimizing power consumption for heating of formation, creation of conditions for periodic temperature increase up to 800–1,200 °C and more with thermal front spreading at given depth from source, preservation during heating of filtration-capacitance properties of near-face area of shaft, operated in mode of product extraction, reduced number of tripping operations, high safety of work on wells.

1 cl, 1 tbl, 2 dwg

FIELD: mining industry.

SUBSTANCE: draining systems, drilled in horizontal well along bed deposit, connected to system of vertical wells drilled from surface, provide access to broad underground area, while vertical well or wells allow effective removal and/or extraction of water, hydrocarbons and other mineral resources.

EFFECT: higher efficiency and productiveness.

10 cl, 11 dwg

FIELD: mining, particularly for drawing-off gases from coal bed simultaneously with water removing from coal bed.

SUBSTANCE: method involves drilling vertical well having cavity from ground surface; communicating vertical well cavity with horizontal drain holes used for gas recovery from coal bed.

EFFECT: provision of access to large underground area from ground surface and uniform coverage thereof, increased efficiency of gas production due to increased drainage system area along the strike of coal bed and due to improved well drilling technique.

27 cl, 11 dwg

FIELD: well drilling, particularly to bore inclined and horizontal wells.

SUBSTANCE: method involves drilling vertical borehole, spudding-in inclined well borehole and serially drilling well profile parts having different radii of curvature, wherein inclined well borehole follows a path with reducing radius of curvature. Well profile parts having different radii of curvature are butted one to another through additional curvilinear borehole intervals having monotonically changing radii of curvature. The additional curvilinear borehole intervals are bored during above well profile parts drilling. Radii of curvature of additional borehole interval and of well profile parts in butt points are equal.

EFFECT: reduced bending stresses in casing pipe and intervals between curvilinear well profile part and vertical and horizontal boreholes, improved casing pipe centering inside well and increased quality of well cementing, as well as improved sucker-rod pump working conditions during well operation.

5 dwg

FIELD: mining industry, particularly to produce loose, soft or single-grained minerals through production boreholes.

SUBSTANCE: method involves installing drilling rig in one point of area to be treated; drilling inclined production boreholes at an angle to horizon; installing pipes in the borehole; assembling hydraulic production equipment and lifting mineral to surface. Drilling rig is installed in one point to be treated so that the drilling rig may perform azimuth and angular rotation in vertical plane. Several production boreholes extending at different angles to horizon in common vertical plane are drilled by the drilling rig. The first borehole has minimal angle defined by maximal possible length of borehole, which can be drilled by the drilling rig. The next borehole has maximal angle defined by rock deformation area to prevent rock deformation on surface and in mineral production equipment installation area. Remainder boreholes are drilled in the same vertical plane at α3, α4, ... απ angles to horizon, which maximizes efficiency of mineral production. Similar inclined boreholes are drilled in other vertical planes by rotating the drilling rig in azimuth direction through γ1, γ2 ... γπ angles. Mineral is produced simultaneously or sequentially from borehole groups to provide smooth lowering of overlaying rock.

EFFECT: increased mineral removing fullness with the use of single equipment unit, reduced amount of construction-and-assembling operations, possibility to perform operations in any season, reduced costs of operation performing in cold season, increased safety for staff and equipment.

2 dwg, 2 ex

FIELD: drilling equipment, particularly used for enlarging drilled bores.

SUBSTANCE: drilling tool used to increase diameter of previously drilled bore comprises body, drilling means comprising drilling bits and adapted to widen the bore to obtain well bore having the second diameter exceeding the first one. Guiding member advancing from above body and adapted to be installed in previously drilled bore guides drilling tool along the bore. Stabilizing surfaces having ribs extending along tool axis are coaxially arranged around the drilling tool between above drilling bits. Stabilizing surface is located behind drilling means. Above stabilizing surfaces may abut upon wall of bore having the second diameter, which provides reduction of transversal force applied to drilling means.

EFFECT: increased stability, which reduces side load applied to drilling means of drilling tool and increased efficiency.

11 cl, 7 dwg

FIELD: well drilling, particularly to control well direction.

SUBSTANCE: device comprises drilling bit, downhole motor with whipstock, whipstock position measuring module, hydraulic orientator and measuring and telemetric module arranged in non-magnetic sub and connected with ground-based reception and processing complex. Whipstock position measuring module comprises body with central flushing orifice on which electrode is arranged. The electrode is located between insulators and is electrically isolated from the body. Electric circuits, measuring sensors, power source and transmission means are installed in the body. Reception and processing means are included in measuring and telemetric module so that the reception and processing means is separated from whipstock position measuring module by electric spacer and is adapted to receive electric signals from whipstock position measuring module transmitter. Accelerometers may be included in measuring sensors of whipstock position measuring module. Whipstock, whipstock position measuring module and hydraulic orientator may be connected one to another by quick-releasable connector, for instance by thread.

EFFECT: increased well quality, possibility to use flexible drilling pipes, namely coiled tubing, for well drilling.

3 cl, 2 dwg

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